Polarization-entangled photon pairs from a single GaAs quantum dot

Elise Bailly, Zoya Polshchykova, Grégoire Saerens +10 more

Yusuke Arashida, T. Hanazawa, Yoshihiro Ogawa +3 more

We have studied photon correlation measurements on the photoluminescence (PL) of a self‐assembled single GaAs quantum dots (QD) under 8 K. The QD exhibited several peaks on the PL spectra arising from the recombination of multi‐excitonic complexes. Photon correlation measurements show several photon pairs emitted from the cascade of neutral and charged biexcitons. The photon pairs of the neutral biexcitons did not exhibit entanglement due to anisotropy of the QD, while we succeeded in observing the entanglement from the photon pairs from the charged biexcitons. This result can be understood by considering the energy structure of the charged states having Kramers doublets in the anisotropic QD.

Fei Ding, Oliver G. Schmidt

Kazuyuki Kuroyama, Marcus Larsson, Sadashige Matsuo +6 more

We demonstrate paired generation of a single photo-electron in a quantum dot and a single photon from a single polarization-entangled photon pair that is generated by spontaneous parametric down conversion. The electron is reated in a GaAs quantum dot via inter-band resonantexcitation by irradiating one of the paired photons on the dot, while the remaining photon is detected by a single photon counter. Because the paired photons are generated simultaneously, the photo-electron and the remaining photon should be observed as a coincident event if the traveling distance is equivalent between them. The coincidence is probabilistic due to the probabilistic generation of the paired photon. We observe the probability of finding the photon with the photo-electron detection substantially higher then that without the photo-electron detection and derive the coincident rate comparable to the emission rate of the original photon pairs.

Y. Yamamoto, Matthew A. Pelton, Charles Santori +1 more

Kristiaan De Greve